2024-12-19
Goal of project
Analysis plan and progress
Some selected results
Next steps and timeline
The goal is to determine to what degree the Core data can be used to approximate the HRS/HCAP classification.
The procedure will be to classify 2016 HRS/HCAP participants into cognitive impairment categories (normal, mild cognitive impairment, dementia) using only data from the HRS 2016 Core interview (i.e., omitting all HRS/HCAP data).
This is only one of several possible approaches to cognitive classification of Core participants.
| Staistical analysis plan | GDoc |
| Detailed analysis results | HTML |
| Mplus output final factor model | TXT |
Factor model for general cognition in HRS/Core (in R)
Adjustment, standardization and normalization (in R)
Equivalent cut point for identifying severe and moderate cognitive impairment to that used in HRS/HCAP algorithm
Operationalize functional impairment in HRS/Core
Run and compare algorithms
Reporting
some tables
The single factor model fits well by conventional fit criteria.
Like the HRS/HCAP factor models, we do not include immediate memory performance in the model.
We do include naming and serial 7s, which are not in HRS/HCAP models
In the normative reference group
NOT in the normative reference group
histogram
In the normative reference group
NOT in the normative reference group
NOT in HRS/HCAP
histogram
Bland-Altman comparison of tf and Tgcp Limits of agreement (Reference Range for difference): -17.052 to 19.963 Mean difference: 1.456 (CI 1.722 to 1.189) Range : -15.198 to 81.953
. tab CogImp if missing(tf)~=1
CogImp | Freq. Percent Cum.
————+———————————– No domains | 2,119 64.62 64.62 1 domain | 663 20.22 84.84 2+ domains | 497 15.16 100.00 ————+———————————– Total | 3,279 100.00
. . centile tf if missing(CogImp)~=1 & missing(tf)~=1, centile(15 35)
Binom. interp.
Variable | Obs Percentile Centile [95% conf. interval]
————-+————————————————————- tf | 3,279 15 36.03611 35.25256 36.42486 | 35 43.36455 42.96254 43.88443
. tab CogImp tfCogImp
| tfCogImp
CogImp | 0 1 2 | Total
———–+———————————+———- No domains | 1,668 345 106 | 2,119 1 domain | 344 190 129 | 663 2+ domains | 120 120 257 | 497 ———–+———————————+———- Total | 2,132 655 492 | 3,279
. kap CogImp tfCogImp
Expected
64.50% 48.33% 0.3130 0.0130 23.98 0.0000